This paper presents a comparison of two very different options for removal of undesirable microorganisms and airborne pollutants from the indoor environment of hospitals, schools, homes and other enclosed spaces using air purifiers and photocatalytic coatings based on nano titanium dioxide (TiO2). Both products were assessed by Life Cycle Assessment (LCA) methodology from cradle to grave. The assessment also includes comparison of two different nano TiO2 production technologies, one by continuous hydrothermal synthesis and the other by a sulfate process. Results of the study showed a relatively large contribution of photocatalytic coatings to reducing the effects of selected indices in comparison with an air purifier regardless of which nano TiO2 production method is utilized. Although the impacts of the sulfate process are significantly lower compared to those of hydrothermal synthesis when viewed in terms of production alone, taken in the context of the entire product life cycle, the net difference becomes less significant. The study has been elaborated within the Sustainable Hydrothermal Manufacturing of Nanomaterials (SHYMAN) project, which aims to develop competitive and sustainable continuous nanoparticle (NP) production technology based on supercritical hydrothermal synthesis. This article is protected by copyright. All rights reserved

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